Signal Too High. Intermittent Fault

Checking Cables and Terminals
- Check CO potentiometer and engine control module (ECM) connectors for loose connections.
- Check the cable between CO potentiometer terminal 3 and engine control module # B1 for an intermittent open-circuit.
- Check cable between CO potentiometer terminal 1 and engine control module # B28 for an intermittent open-circuit.
- Check cable between CO potentiometer terminal 2 and engine control module # B32 for an intermittent short-circuit to supply voltage and an intermittent open-circuit.
- The CO potentiometer power cable is connected to the air conditioning (A/C) pressure sensor power cable inside the engine control module.
- In cars without an air conditioning pressure sensor the wiring is pre-routed. It should always be checked.
- Check cables between: CO potentiometer terminal 3 and engine control module # B1 and Air conditioning pressure sensor terminal 3 and engine control module # B29 for an intermittent short-circuit to ground and an intermittent short-circuit to supply voltage.
- Proceed to: Fault-tracing Information section below.

Fault-tracing Information
For intermittent faults fault-tracing is not followed by a verification because the fault is not present at this moment.

- Do you want to repeat fault-tracing?

Yes:
^ Proceed to: Checking Cables and Terminals section above.

No:
^ Operation done.